Robotarm exemple

[Bio boujelben]

Dear all,

In order to be familiar with the command Link, I m trying to reproduce the example "robotarm"(multi body system of 2 beams connected with hink) . But, I didn't get expected results.

 you find attached my input file. Do you have some suggestions ?

Thank you very much.

[Prof. R.L. Taylor]

Have you checked all the files (output and log) to see if there are any warnings or errors?

I am not sure that link will work with rotational parameters in finite deformation frame problems.  In general in the past we have used 'joints' to constrain behavior between such problems.  You may want to try using the joints instead of links.  Also, before doing the problem with a joint try doing the solution with a single member to make sure your boundary conditions perform as you expect.  That is, can you rotate and translate the end of a frame? 

[Bio boujelben]

Dear P.Taylor,

Thank you for your reply. but, I feel really confused. As I read in the manuel, we can use joint command for rigid body connections. However, At present the rigid body options are limited to solid (continuum) elements only. So, can I define a frame as a rigid body to use joint command ?
Also, to input constant angular velocity, I used this command :
GLOBal
OMEGA radian omega
OMEGA COORd x y z
OMEGA VECTor n_x n_y n_z

but it doesn't give me what i expect.

Kind regards.